How to set up CMake to build an app for the iPhone

I finally figured out how to do this. Here's what my CMakeLists.txt file looks like:

project(test)set(NAME test)file(GLOB headers *.h)file(GLOB sources *.cpp)set(CMAKE_OSX_SYSROOT iphoneos2.2.1)set(CMAKE_OSX_ARCHITECTURES $(ARCHS_STANDARD_32_BIT))set(CMAKE_CXX_FLAGS "-x objective-c++")set(CMAKE_EXE_LINKER_FLAGS    "-framework AudioToolbox -framework CoreGraphics -framework QuartzCore -framework UIKit")link_directories(\${HOME}/\${SDKROOT}/lib)set(MACOSX_BUNDLE_GUI_IDENTIFIER "com.mycompany.\${PRODUCT_NAME:identifier}")set(APP_TYPE MACOSX_BUNDLE)add_executable(${NAME}    ${APP_TYPE}    ${headers}    ${sources})target_link_libraries(${NAME}    # other libraries to link)# code signingset_target_properties(${NAME} PROPERTIES XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "iPhone Developer: My Name")

Obviously, change mycompany to your company name, and change My Name to your name. I found it's very useful to add the link directory \${HOME}/\${SDKROOT}/lib as above, so that if your app links to a static library (especially a generic (non-iPhone) library), you can build separate iPhoneOS and iPhoneSimulator libraries and easily link to the right one, instead of worrying about a universal binary.

Also, Xcode doesn't seem to properly add resources when you build the project using CMake, so I added this piece to the CMakeLists.txt file. It copies the entire folder /data into my resources folder (as if I had added a "blue" folder link in Xcode).

# copy resource phaseset(APP_NAME \${TARGET_BUILD_DIR}/\${FULL_PRODUCT_NAME})set(RES_DIR ${test_SOURCE_DIR}/data)add_custom_command(    TARGET ${NAME}    POST_BUILD    COMMAND /Developer/Library/PrivateFrameworks/DevToolsCore.framework/Resources/pbxcp -exclude .DS_Store -exclude CVS -exclude .svn -resolve-src-symlinks ${RES_DIR} ${APP_NAME})

For frameworks, I found this message http://www.mail-archive.com/cmake@cmake.org/msg24659.html I grabbed enough information for this:

SET(TARGETSDK iPhoneOS3.1.2.sdk)SET(CMAKE_OSX_SYSROOT /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/${TARGETSDK})macro(ADD_FRAMEWORK fwname appname)    find_library(FRAMEWORK_${fwname}        NAMES ${fwname}        PATHS ${CMAKE_OSX_SYSROOT}/System/Library        PATH_SUFFIXES Frameworks        NO_DEFAULT_PATH)    if( ${FRAMEWORK_${fwname}} STREQUAL FRAMEWORK_${fwname}-NOTFOUND)        MESSAGE(ERROR ": Framework ${fwname} not found")    else()        TARGET_LINK_LIBRARIES(${appname} ${FRAMEWORK_${fwname}})        MESSAGE(STATUS "Framework ${fwname} found at ${FRAMEWORK_${fwname}}")    endif()endmacro(ADD_FRAMEWORK)

Instead of setting CMAKE_EXE_LINKER_FLAGS, now I do:

ADD_FRAMEWORK(AudioToolbox MyApp)ADD_FRAMEWORK(CoreGraphics MyApp)ADD_FRAMEWORK(QuartzCore MyApp)ADD_FRAMEWORK(UIKit MyApp)

This does work for OpenGLES as well.

Recent CMake versions pass .m and .mm files to the C++ compiler, which detects the language through the extension, so you don't need to add "-x objective-c++" to the flags explicitly.